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        <h4 id="基本问题2"><a href="#基本问题2" class="headerlink" title="基本问题2"></a>基本问题2</h4><p><strong>例1 ：</strong> 输出结果？</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">test</span></span>&#123;</span><br><span class="line">     <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>&#123;</span><br><span class="line">    <span class="keyword">for</span> (<span class="keyword">int</span> i = <span class="number">0</span>; i &lt;= <span class="number">10</span>; i++)</span><br><span class="line">        Integer k = <span class="keyword">new</span> Integer(i);</span><br><span class="line">    System.out.println(<span class="string">"Hello World"</span>);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<pre><code>A. Hello World

B. Hello

C. 编译错误

D. 都不对
</code></pre><p><strong>例2 ：</strong> Consider a function which, for a given whole number n, returns the number of ones required when writing out all numbers between 0 and n.<br>For example, f(13)=6. Notice that f(1)=1. What is the next largest n such that f(n)=n？（解释：有一个整数n，写一个函数f(n)，返回0～n之间出现的“1”的个数。比如f(1)=1；f(13)=6（1、10、11、12、13一共6个1），问一个最大的f(n)=n中的n是什么？）</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Test</span> </span>&#123;</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>&#123;</span><br><span class="line">        <span class="keyword">int</span> n = <span class="number">2</span>;</span><br><span class="line">        <span class="keyword">int</span> res=<span class="number">1</span>;</span><br><span class="line">        <span class="keyword">while</span>((getonly(n)+res) != n) &#123;</span><br><span class="line">            res+=getonly(n);</span><br><span class="line">            ++n;</span><br><span class="line">        &#125;</span><br><span class="line">        System.out.println(n);</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="function"><span class="keyword">static</span> <span class="keyword">int</span> <span class="title">getonly</span><span class="params">(<span class="keyword">int</span> num)</span></span>&#123;</span><br><span class="line">        <span class="keyword">int</span> number=<span class="number">0</span>;</span><br><span class="line">        String s=num+<span class="string">""</span>;</span><br><span class="line">        <span class="keyword">int</span> len=s.length();</span><br><span class="line">        <span class="keyword">if</span>(len!=<span class="number">0</span>)&#123;</span><br><span class="line">              <span class="keyword">for</span>(<span class="keyword">int</span> i=<span class="number">0</span>;i＜len;i++)&#123;</span><br><span class="line">                    <span class="keyword">char</span> a=s.charAt(i);</span><br><span class="line">                    <span class="keyword">if</span>(a==<span class="string">'1'</span>)&#123;</span><br><span class="line">                        number++;</span><br><span class="line">                    &#125;</span><br><span class="line">              &#125;</span><br><span class="line">        &#125;<span class="keyword">return</span> number;</span><br><span class="line">     &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p><strong>例3 ：</strong> Which of the choices below correctly describes the amount of time used by the following code(哪个正确描述了代码的调度次数)？</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">n = <span class="number">10</span>;</span><br><span class="line"><span class="keyword">for</span>(i=<span class="number">1</span>;i&lt;n;i++)</span><br><span class="line">    <span class="keyword">for</span>(j=<span class="number">1</span>;j&lt;n;j+=n/<span class="number">2</span>)</span><br><span class="line">        <span class="keyword">for</span>(k=<span class="number">1</span>;k&lt;n;k=<span class="number">2</span>*k)</span><br><span class="line">            x = x + <span class="number">1</span>;</span><br></pre></td></tr></table></figure>
<pre><code>A. O(n^3)

B. O(n2log n)

C. O(n(log n)*2)

D. O(n log n)
</code></pre><p><strong>例4 ：</strong> 筛选法100以内的素数？</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br></pre></td><td class="code"><pre><span class="line">    <span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Test</span></span>&#123;</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String argv[])</span></span>&#123;</span><br><span class="line">    &#123;</span><br><span class="line">      <span class="keyword">int</span> a[<span class="number">101</span>],i,j;</span><br><span class="line">      <span class="keyword">for</span> (i=<span class="number">1</span>;i＜<span class="number">101</span>;i++)</span><br><span class="line">          a[i]=<span class="number">1</span>;</span><br><span class="line">    /＊根据筛选法求出<span class="number">100</span>以内的所有素数，所谓筛选法，是指从小到大筛去一个已知素数的所有倍数。例如，根据<span class="number">2</span>，</span><br><span class="line">我们可筛去<span class="number">4</span>,<span class="number">6</span>,<span class="number">8</span>,...,<span class="number">98</span>,<span class="number">100</span>等数，然后根据<span class="number">3</span>可筛去<span class="number">9</span>,<span class="number">15</span>,... ,<span class="number">99</span>等数(注意此时<span class="number">6</span>、<span class="number">12</span>等数早就被筛去了)，由于<span class="number">4</span>被筛去了，下一个用于筛选的素数是<span class="number">5</span>，以此类推，最后剩余的就是<span class="number">100</span>以内的素数＊/</span><br><span class="line">    <span class="keyword">for</span> ( i=<span class="number">2</span>;i＜<span class="number">101</span>;i++)</span><br><span class="line">        &#123;</span><br><span class="line">          <span class="keyword">if</span> (a[i]!=<span class="number">0</span>)</span><br><span class="line">          <span class="keyword">for</span> (j=i+i;j＜<span class="number">101</span>;)</span><br><span class="line">            &#123;</span><br><span class="line">                <span class="keyword">if</span> (j%i==<span class="number">0</span>)</span><br><span class="line">                  a[j]=<span class="number">0</span>;</span><br><span class="line">                  j=j+i;</span><br><span class="line">            &#125;</span><br><span class="line">          &#125;</span><br><span class="line">      <span class="keyword">for</span>(i=<span class="number">2</span>;i＜<span class="number">101</span>;i++)</span><br><span class="line">          <span class="keyword">if</span> (a[i]!=<span class="number">0</span>)</span><br><span class="line">          System.out.println(i);</span><br><span class="line">    &#125;</span><br></pre></td></tr></table></figure>
<ul>
<li>普通算法<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">boolean</span> <span class="title">numberIsPrime</span><span class="params">(<span class="keyword">int</span> n)</span> </span>&#123;</span><br><span class="line">    <span class="keyword">for</span> (<span class="keyword">int</span> i = <span class="number">2</span>; i &lt; n; i++) &#123;</span><br><span class="line">        <span class="keyword">if</span> (n % i == <span class="number">0</span>) &#123;</span><br><span class="line">            <span class="keyword">return</span> <span class="keyword">false</span>;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">return</span> <span class="keyword">true</span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
</ul>
<h4 id="Java内存管理"><a href="#Java内存管理" class="headerlink" title="Java内存管理"></a>Java内存管理</h4><p><strong>例2 ：</strong> 正确结果？</p>
<pre><code>A. Java虚拟机中的自动垃圾回收机阻止程序运行移除内存

B. 一段程序可以建议垃圾回收执行，但是不能强迫他执行

C. 垃圾回收是一个独立的平台

D. 当一个对象的所有引用都没置为空时，这个对象就可以变为能被垃圾回收
</code></pre><p><strong>例2 ：</strong> 符合垃圾收集器的收集标准？</p>
<p>A. object sobj = new object();</p>
<p>B. object sobj = null;</p>
<p>C. object sobj = new object();</p>
<p>D. sobj = new object();</p>
<p><strong>例3 ：</strong> 符合垃圾收集器的收集标准？</p>
<pre><code>A. object aobj = new object();

B. object bobj = new object();

C. object cobj = new object();

D. aobj = bobj;

E. aobj = cobj;

F. cobj = null;

G. aobj = null;
</code></pre><p>​    </p>
<h4 id="面向对象"><a href="#面向对象" class="headerlink" title="面向对象"></a>面向对象</h4><p><strong>例1 ：</strong> 编译时会产生错误的？</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">reverseIt4</span></span></span><br><span class="line"><span class="class">    </span>&#123;</span><br><span class="line">      <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span></span></span><br><span class="line"><span class="function">      </span>&#123;</span><br><span class="line">          EnclosingClass jb2;               <span class="comment">//-----1</span></span><br><span class="line">        System.out.println(jb2.m);          <span class="comment">//-----2</span></span><br><span class="line">      &#125;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="class"><span class="keyword">class</span> <span class="title">EnclosingClass</span>                    //--------3</span></span><br><span class="line"><span class="class">    </span>&#123;</span><br><span class="line">      <span class="keyword">public</span> <span class="keyword">int</span> m = <span class="number">6</span>;</span><br><span class="line">    <span class="class"><span class="keyword">class</span> <span class="title">InnerClass</span>                        //-------4</span></span><br><span class="line"><span class="class">      </span>&#123;</span><br><span class="line">          <span class="keyword">int</span> msquare;</span><br><span class="line">          InnerClass()</span><br><span class="line">          &#123;</span><br><span class="line">              msquare = m＊m;</span><br><span class="line">          &#125;</span><br><span class="line">      &#125;</span><br><span class="line">    &#125;</span><br></pre></td></tr></table></figure>
<pre><code>A.语句1

B.语句2

C.语句3

D.语句4
</code></pre><p><strong>例2 ：</strong> 不是Object类所定义的public method？</p>
<pre><code>A. finalize()

B. clone()

C. wait()

D. sleep()
</code></pre><p><strong>例3 ：</strong> The code output（下列代码输出结果是什么？）</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> java.util.＊;</span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Test</span> </span>&#123;</span><br><span class="line"><span class="keyword">private</span> String value = <span class="keyword">null</span>;</span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="title">Test</span><span class="params">(String v)</span> </span>&#123;</span><br><span class="line">      value = v;</span><br><span class="line">  &#125;</span><br><span class="line">  <span class="function"><span class="keyword">public</span> <span class="keyword">boolean</span> <span class="title">equals</span><span class="params">(Test o)</span> </span>&#123;</span><br><span class="line">      <span class="keyword">if</span> (o == <span class="keyword">this</span>)</span><br><span class="line">            <span class="keyword">return</span> <span class="keyword">true</span>;</span><br><span class="line">      <span class="keyword">if</span> (o <span class="keyword">instanceof</span> Test) &#123;</span><br><span class="line">            Test test = (Test) o;</span><br><span class="line">            <span class="keyword">return</span> value.equals(test.value);</span><br><span class="line">      &#125;</span><br><span class="line">      <span class="keyword">return</span> <span class="keyword">false</span>;</span><br><span class="line">  &#125;</span><br><span class="line">  <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>&#123;</span><br><span class="line">      List list = <span class="keyword">new</span> ArrayList();</span><br><span class="line">      Test test1 = <span class="keyword">new</span> Test(<span class="string">"object"</span>);</span><br><span class="line">      Test test2 = <span class="keyword">new</span> Test(<span class="string">"object"</span>);</span><br><span class="line">      Test test3 = <span class="keyword">new</span> Test(<span class="string">"object"</span>);</span><br><span class="line">      object test4 = <span class="keyword">new</span> Test(<span class="string">"object"</span>);</span><br><span class="line">      list.add(test1);</span><br><span class="line">      System.out.println(list.contains(test2));</span><br><span class="line">      System.out.println(test2.equals(test3));</span><br><span class="line">      System.out.println(test3.equals(test4));</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<pre><code>A.false true false

B.true true true

C.false false false

D.false true true
</code></pre>
      
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